Measurement of gas holdup characteristics in two-phase column flotation by electrical capacitance volume tomography

Electrical capacitance volume tomography measured the gas holdup in two-phase column flotation. The purpose was to characterize gas holdup and understand its relation to flow patterns as a function of the types and doses of frothers. Experiments were conducted using laboratory-scale column flotation cells with dimensions of 5 x125 cm. The superficial gas velocities in the experiment were 0.5-4 cm s-1 with an interval of 0.5 cm/s. Methyl isobutyl carbinol (MIBC) and Oreprep F-583-OZ (Oreprep) were used as frothers at 5-40 ppm doses. The results showed that the difference between the lowest and highest gas holdup in the bubbly flow regime was similar to 0.07, and the transition from the bubbly to churn-turbulent flow occurred at a superficial gas velocity of 2 c m /s .